Survey- For those with misfire issues

[Cburgess33]

report date: 07jun2021
Build date: 10Oct19
Mileage when it first occurred: ~10,800
How many times has it occurred: twice, once in mid-May, most recent 31may21
What exact codes did it throw: PO 300 at dealer service bay
Is the issue on going? CEL 'self-healed' 03jun21, prior to going in for today's service appointment
If so, what has been done to try to solve the issue? new camshaft to be installed, per FAC warranty. Never did note mis-firings, smells or loss-of-power.
Was the issue ever fully resolved? not yet . . .

-Bought this (otherwise Great!) truck, (pre-owned w/9M miles) in late March19.
-Had periodic (ultimately self-healing) AutoStop warnings 2-3 times.
-CEL came on 31may. went to dealer 01jun21.
-Dealer appointment 01Jun showed a CEL PO300 code; appointment made for follow up this morning 07jun21.
-CEL went off after gas fill on 03Jun.
-Took to dealer appointment this morning, waited in customer lounge.
-After 20minutes, service rep informed me the dealership was corporate-authorized to 'replace the camshaft' (!). (thought this might result this morning in a software update, but noooooo.)
-I do not know of any testing today, but in twenty minutes how much could you do???
- was promised return on 'Thurs/Fri'. Parts on order from Atlanta. We'll see.

Question for the Board: My wife & I have a 2400-mile road trip planned for the third week+ of June. My confidence in a reliable ride from my new-to-me truck has been dented, if not crushed.
We have road service memberships. Should an authorized-dealer installation of a new camshaft necessarily cause any change in these plans???

I will just add a couple of observations . I havent had this issue at all but have tuned my vehicle and in the process of doing so learned a few things :

1)Auto/Stop error can happen if engine is running slightly out of tolerance. It will get disabled as protection and doesnt always result in a CEL
2)Previous owner could have had issues with the misfire and you would not have known . (since you are saying it was pre-owned) . You might have just pulled the cel but problem could have been persistent . The auto/stop warnings you get may have been a tell that something wasn’t right . Everyone thinks those auto/stop warnings are indicative of a secondary battery going bad but that is def not the only case for them
3) I wouldnt change plans . It sounds like the misfires are intermittent. Its bad and can cause permanent damage but you should be covered on warranty ? and you are saying you would do the trip after they did replacement ? If so that be a good chance to test out the changes/ fixes ..


just my two cents and good luck

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[paul hinchcliff]

-Error correction from post #1365: bought the JT20 in late March '21, not '19

thanks Chris . . .



Report date: 07jun2021
Build date: 10Oct19
Mileage when it first occurred: ~10,800
How many times has it occurred: twice, once in mid-May, most recent 31may21
What exact codes did it throw: PO 300 at dealer service bay
Is the issue on going? CEL 'self-healed' 03jun21, prior to going in for today's service appointment
If so, what has been done to try to solve the issue? new camshaft to be installed, per FAC warranty. Never did note any mis-firings, smells or loss-of-power. Just the CEL light.
Was the issue ever fully resolved? not yet . . .

-Bought this (otherwise Great!) truck, (pre-owned w/9M miles) in late March21.
-Had periodic (ultimately self-healing) AutoStop warnings 2-3 times.
-CEL came on 31may. went to dealer 01jun21.
-At the Dealer visit 01Jun the then-existing CEL threw a PO300 code;
-appointment made for follow-up 07jun21.
-CEL went off after gas fill on 03Jun.
-Took the truck to dealer appointment this morning, waited in customer lounge.
(thought this morning's check -was initially advised- might result in a simple software update, but noooooo.)
-After only 20minutes and without a CEL showing, the service rep informed me the dealership was corporate-authorized to 'replace the camshaft' (!).
-I do not know of any testing done today, but in twenty minutes how much could they do???
- was promised return on 'Thurs/Fri'. Parts on order from Atlanta. We'll see.
-had to cancel this week's fishing trip, dammit.

 

[CallMeJoe]

I just got my 20 jtr back after 4 days in the shop. I've had the P0300 code since 2 days after purchase. I have a good dealer and mechanic and he's worked with me on the problem. After a few "research" trips to the dealer for this (they've been letting me keep and drive it) they got the okay from FCA to replace the 2,4,6 passenger side cam with the new updated part #. I just got it back so not much driving yet, but it seems to run smoother, although it never really ran rough. Seems to have a bit more giddyup.
I'd like to know the whole story behind the code but it may be some time before we get all the details on mystery P0300.

 

[paul hinchcliff]

-Error correction from post #1365: bought the JT20 in late March '21, not '19

thanks Chris . . .



Report date: 07jun2021
Build date: 10Oct19
Mileage when it first occurred: ~10,800
How many times has it occurred: twice, once in mid-May, most recent 31may21
What exact codes did it throw: PO 300 at dealer service bay
Is the issue on going? CEL 'self-healed' 03jun21, prior to going in for today's service appointment
If so, what has been done to try to solve the issue? new camshaft to be installed, per FAC warranty. Never did note any mis-firings, smells or loss-of-power. Just the CEL light.
Was the issue ever fully resolved? not yet . . .

-Bought this (otherwise Great!) truck, (pre-owned w/9M miles) in late March21.
-Had periodic (ultimately self-healing) AutoStop warnings 2-3 times.
-CEL came on 31may. went to dealer 01jun21.
-At the Dealer visit 01Jun the then-existing CEL threw a PO300 code;
-appointment made for follow-up 07jun21.
-CEL went off after gas fill on 03Jun.
-Took the truck to dealer appointment this morning, waited in customer lounge.
(thought this morning's check -was initially advised- might result in a simple software update, but noooooo.)
-After only 20minutes and without a CEL showing, the service rep informed me the dealership was corporate-authorized to 'replace the camshaft' (!).
-I do not know of any testing done today, but in twenty minutes how much could they do???
- was promised return on 'Thurs/Fri'. Parts on order from Atlanta. We'll see.
-had to cancel this week's fishing trip, dammit.

-Error correction from post #1365: bought the JT20 in late March '21, not '19

thanks Chris . . .



Report date: 07jun2021
Build date: 10Oct19
Mileage when it first occurred: ~10,800
How many times has it occurred: twice, once in mid-May, most recent 31may21
What exact codes did it throw: PO 300 at dealer service bay
Is the issue on going? CEL 'self-healed' 03jun21, prior to going in for today's service appointment
If so, what has been done to try to solve the issue? new camshaft to be installed, per FAC warranty. Never did note any mis-firings, smells or loss-of-power. Just the CEL light.
Was the issue ever fully resolved? not yet . . .

-Bought this (otherwise Great!) truck, (pre-owned w/9M miles) in late March21.
-Had periodic (ultimately self-healing) AutoStop warnings 2-3 times.
-CEL came on 31may. went to dealer 01jun21.
-At the Dealer visit 01Jun the then-existing CEL threw a PO300 code;
-appointment made for follow-up 07jun21.
-CEL went off after gas fill on 03Jun.
-Took the truck to dealer appointment this morning, waited in customer lounge.
(thought this morning's check -was initially advised- might result in a simple software update, but noooooo.)
-After only 20minutes and without a CEL showing, the service rep informed me the dealership was corporate-authorized to 'replace the camshaft' (!).
-I do not know of any testing done today, but in twenty minutes how much could they do???
- was promised return on 'Thurs/Fri'. Parts on order from Atlanta. We'll see.
-had to cancel this week's fishing trip, dammit.

update to post #1367:

My JT20 was dealer-serviced 07-08Jun.
Dealer installed new 2-4-6 cam under warranty, at 11M miles.
Never had experienced any obvious misfires, but had thrown a PO300 code, twice.
Two long post-repair day-drives show no CEL,
and as reported here elsewhere , the truck does seem to be a bit 'peppier'.
No compression or other test results were reported on my dealer post-repair query.
Note 10/19 build date, which seems to be common in this survey.
A long cross-country trip w/ the bed full is eminent, but much confidence has been restored.

Is there a survey compilation from this considerable data set in our future? I hope so.
This thread has been very informative and helpful, equally or more-so, than the info gleaned from my dealer repair staff. Thank you.

 

[PJM86]

I wonder how many 10/19 engines have had misfire. I have a 10/19 build and have been watching this thread. I have not had the misfire, I did have my pcm updated since owning it.

 

[Freetime]

Build date: (12-19) 110509 504AA
Mileage when first occurred: 110 miles (took delivery on 9/17/20 @ 100miles)
How many times has it occurred: 9 CEL's - 56 (A)! stop/.start
What exact code did it throw: P0300
Is issue ongoing: yes
Was issue ever fully resolved: No
Current milage 5130, I have manually pushed the stop/start disable button since 10/16/20 @3620 miles, still activates (A)!. RRT 20-53 has been done, dealer tries to be helpful but I don't think JEEP really has any solution. I don't fully trust my Gladiator.

 

[ExitLeft]

I wonder how many 10/19 engines have had misfire. I have a 10/19 build and have been watching this thread. I have not had the misfire, I did have my pcm updated since owning it.

mine was a 11/19 build that I purchased last August. FCA/Stellantis just bought it back from me last week after i retained an attorney. Last fall the dealer replaced the batteries to no avail. Then they allegedly reindexed the cams and did some software updates. It seemed to be fine , but then it started with a rough idle again. Dealer made three attempts to fix it and had it for 32 days thus qualifying for the Lemon Law here in PA. On top of that the radio started freezing and rebooting randomly a few weeks before I turned it in. I‘m glad to be rid of it. Total refund for everything I paid minus $100 or so for mileage.

below is my earlier post in this thread.

Mine goes in tomorrow. stop/start issues intermittently since about 450 miles and the Check Engine Light came on on Thursday at just under 800 miles. both lights are off now and I put over 100 miles on it yesterday without issue. Although, it feels like there’s a slightly rough idle and a stumble at idle. I guess I’ll see what they want to do. CEL isn’t currently on, but I want them to read the saved code and record it in the system so it’s established as a problem. I read the code and is P0300 as I feared.
My MDH is 111313. Nov 13th at 1pm (A nice Wednesday afternoon build)

 

[Bama_Swampfox]

Well, my luck ran out this week at 9,700 miles. Almost every time I start the engine now, cold or hot, regardless of ambient temperature, I get ESS error - a CEL about every third time.

Just got an email from a friend of mine: apparently there is a FCA Bulletin out for replacing the right side Intake Camshaft and a software update.

Has anyone seen this Bulletin?

 

[ShadowsPapa]

Well, my luck ran out this week at 9,700 miles. Almost every time I start the engine now, cold or hot, regardless of ambient temperature, I get ESS error - a CEL about every third time.

Just got an email from a friend of mine: apparently there is a FCA Bulletin out for replacing the right side Intake Camshaft and a software update.

Has anyone seen this Bulletin?

You mean this one?

 

[Bama_Swampfox]

You mean this one?

Must be the one. Thanks! Anyone have "complications" as a result of this repair?

 

[flatboycms]

Must be the one. Thanks! Anyone have "complications" as a result of this repair?


I recall it did fix some but it did not fix mine. From that repair they noticed the timing chain was loose, replaced that, then the vehicle started to stall. Then they replaced the chain, tensioner, vvvt gears and then it started to die more frequently and back on Feb 2021 they bought it back 1,600 miles on it.. I am in a 2021 Mojave right now with 2k on it. I dont want to jinx it so I will leave it at that.

 

[ShadowsPapa]

This TSB is dated March of 2021 - so they'd not have applied this specific TSB if you sold it back to them in February.....must have been another one.

 

[flatboycms]

This TSB is dated March of 2021 - so they'd not have applied this specific TSB if you sold it back to them in February.....must have been another one.

My apologies.

 

[BT911]

2 questions
1. If you are using a OBD reader and you have misfire codes but never had CEL will the dealership look into it?
2. What happens if you get to the buyback stage and are leasing?

 

[ShadowsPapa]

2 questions
1. If you are using a OBD reader and you have misfire codes but never had CEL will the dealership look into it?
2. What happens if you get to the buyback stage and are leasing?

Yes. My wife's WK2 had a bad misfire. NO MIL
I used my OBD reader and found the codes - and saved the file and printed it.
I took it to them and showed them the printout.
The silly thing would not act up for them but since I had a very detailed printout for them, they dug and found a TSM that sort of applied and fixed it.

My JT had stored codes for the trailer brake controller issue (ABS stored codes) but never had a MIL show -

The light doesn't have to come on if there's a stored code. If there's not a stored code and you have a code reader - save the file for them.
Transient things that trigger the a stored code won't set the light. (sometimes won't even store the code, that's why I suggest if you have a way to read it, save the file and print it for them.)

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